XML 54 R36.htm IDEA: XBRL DOCUMENT v3.22.1
Stock-based compensation (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Based Compensation Expense
The following table summarizes the stock-based compensation expense recognized in the three months ended March 31, 2022 and 2021 (in thousands):
 Three Months Ended
March 31,
 20222021
Cost of goods sold$525 $548 
Research and development774 862 
Sales and marketing385 554 
General and administrative931 1,313 
 $2,615 $3,277 
Schedule of Stock Option and Restricted Stock Unit Activity
The following table summarizes the Company’s stock option and RSU activity, excluding market and performance-based RSUs, during the three months ended March 31, 2022: 
Stock OptionsRestricted Stock Units
 Number of
Shares		Number of
Units
Balance as of December 31, 20211,279,222 3,387,315 
Granted
— 18,551 
Exercised/Converted
(74,271)(26,365)
Cancelled/Forfeited
— (39,612)
Balances at March 31, 20221,204,951 3,339,889 
Schedule of Estimated Fair Value of Certain Stock-Based Awards using Black-Scholes-Merton Valuation Model The fair value of market-based RSUs was measured on the grant date using Monte Carlo simulation model with the following assumptions:
Assumptions
Used
Weighted-average volatility66%
Risk-free interest rate2.79%
Expected dividends—%